A Stovebolt harmonic balancer cannot slip. It is simply two round plates with a flat round rubber disk sandwiched between them.The two plates, the rubber disk, the crank snout and pulley are held together by numerous sturdy rivets. Even if you sheared all of those rivets, all that would happen is that the entire assembly would fall off into its many parts leaving you with just the snout left on the crank.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission